Aaand I tested another new exciting part (which I am a bit proud of tbh): Plug&Play SU throttle cable conversion kit. Doesn't require any modification to the car at all (ball type connector to throttle pedal, custom made clamp lever attaches to throttle shaft, bowden tube holder plate attaches to balance bar). It also maintains the original fast throttle adjustment screw for setting up the carbs (replaces the original plate).
I used Teflon lined bowden tube and high end cables for minimal friction. I had all parts laser cut, machined them afterwards and had everything yellow zinc coated to match the rest of the car. I'd say it looks pretty OE.
Even though my throttle linkage was in perfectly fine condition before, the difference is unbelievable (to me at least). Drivability has improved incredibly. Heel&Toeing is so much more rewarding now and there's no more jerky stop and go traffic pedal control.